Derby Playbook was launched in December, 2012 by Gandreas Software. It’s a WFTDA roller derby track layout that you can draw on and move skaters around the track. You can also set key frames with your skaters and playback their movements over a 2 minute jam. Pretty neat idea and a perfect idea for any coaches out there. I don’t think every skater needs it but for $5.00 why not give it a try. I would really like the developer to add the ability to export a jam as a video file in the future.